本文就經學、術數學角度切入，探討術數之作對於九宮之發揮。九宮之說，原見於《禮記‧月令》、《大戴禮記‧明堂》等典籍，其中以《易緯乾鑿度》發揮較多，有「太一行九宮」之說，而後又以九宮配八卦，自成一套系統。術數之作方面，本文舉以遁甲、相宅為例，分析其中發揮九宮之說情形。遁甲屬於式占一類，其天、地盤諸說，乃根本於九宮，輔以節氣、時位論以凶吉；而相宅為相法一類，亦以九宮為基礎，結合八卦陰陽之屬，配合居宅者之命，以應災祥。本文無意迷信於徵驗，僅期以藉此釐清術數學發揮附會經義之情形，並從中理解術數諸說之系統學理。

This paper aims to discuss the writings about JiuGong exploration through viewpoints of classics learning and methods. JiuGong theory, first appeared in “The Book of Rites”and “The Rites.” “The Book of Changes”layouts more details on JiuGong with the eight diagrams,the formation of a system. This paper analyzes the content of JiuGongTu theory based on DunJia and Geomancy. Rather than a superstitious views this paper aims to clarify the situations through the classics learning and methods point and learn about its system knowledge.